Update index.js

minor typo fix

Author: hexbreak

exercises/03.1-your-first-component/index.js

@@ -5,5 +5,5 @@ export const PrintHello = () => {
 return <h1>I Love React</h1>;
 };
 
-// change the syntaxt of the first parameter to make it <PrintHello /> instead of PrintHello()
+// change the syntax of the first parameter to make it <PrintHello /> instead of PrintHello()
 ReactDOM.render(PrintHello(), document.querySelector("#myDiv"));